File Extensions

File Associations and Related File Types

File Extensions Beginning with "U"

.u AU Audio File
.u Unreal Tournament Class Package
.u Subsampled Raw YUV Image
.u10 UFile 2010 Tax Return
.u11 UFile 2011 Tax Return
.u12 UFile 2012 Tax Return
.u3d Universal 3D File
.u3i U3 Application Information File
.u3p U3 Smart Application
.uax Unreal Audio Package
.ub Unsigned Byte Audio File
.uc UnrealScript Class
.uc2 UltraCompressor 2 Archive
.uci UFS Explorer Backup File
.ud OmniPage User Dictionary
.udb Dynamics AX User Database File
.udf Universal Disk Format File
.udf Microsoft Excel User-defined Function
.ufo Ulead File Object
.uha UHarc Compressed Archive
.ui User Interface File
.uibak UltraISO Backup Disk Image
.uif Universal Image Format Disc Image
.uis WindowBlinds User Interface Specification
.ukx Unreal Animation Package
.ulaw Raw u-Law Audio File
.ulf Universal List File
.uls NetMeeting User Location Service File
.ult UltraTracker Module
.ulw u-Law Audio File
.ulz USBlyzer Data Capture File
.uml UML Data Object Model
.umlclass UML Class Model
.umod Unreal Tournament Module File
.umx Unreal Music Package
.unauth SiteMinder Unauthorized Message File
.uni MikMod UniMOD Module
.unity3d Unity Web Player Archive
.unk Unknown File
.unknown Unknown File Type
.unr Unreal Level Map
.unx Unix Text File
.uop Ultima Online Patch
.upd Program Update Information
.upoi iGO Points of Interest File
.upx Ultimate Packer for eXecutables File
.url URL Shortcut File
.urt Utah Raster Toolkit File
.usa Unreal Saved Game File
.usf Nintendo 64 Music File
.usflib Nintendo 64 Song Library
.usx Unreal Static Meshes
.ut2 Unreal Tournament Map
.ut2mod Unreal Tournament 2003/2004 Module File
.ut3 Unreal Tournament 3 Map File
.utc Bioware Creature File
.utf8 Unicode UTF8-Encoded Text Document
.utx Unreal Texture Package
.utxt Unicode Text File
.uu Uuencoded File
.uud UUDecoded File
.uue Uuencoded File
.uvf Uncertain Value Format
.uvx Unreal Tournament 2003 Saved Game
.uw Unsigned Word Audio File
.uwf UltraTracker Wave File
.uxx Unreal Tournament Cache